These dolly wheel drive plates provide you with a way to create an easy to assemble, low friction, drive system or motorized dolly platform. The drive B type plates are designed to work with a motor and 1\u201d - 2\u201d OD aluminum tubing or PVC pipe from your local hardware store. Each dolly wheel drive plate utilizes the 1.5\" hub pattern and are sold in pairs of two.\n\n